Switching betwen two directories in Bash

The pushd command remembers the last pushd’ed from directory
#cd /
#pushd /home
#pwd
/home
#pushd
#pwd
/
But quicker is “~-” which will simply take you back to the last working directory
#cd /
#cd /home
#pwd
/home
#cd ~-
#pwd
/

giving permission to read a specific file using sudo:
visudo
    #Support Staff
    Cmnd_Alias = LOGS = /bin/cat /var/log/squid/access.log, /bin/zcat /var/log/squid/access.log.[0-9].gz
    %logaccess ALL (all) NOPASSWD: LOGS
This gives access to the Squid Logs to anyone in the logaccess group.
(sudo zcat /var/log/squid/access.log.1.gz) | grep "microsoft.com"

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Using the file ~/.muttrc you can set the FROM address in outbound messages from the root user to an arbitrary but more appropriate value:
vim ~/.muttrc
Add the lines:

set from=noreply@my.domain
set envelope_from=yes
set realname=NoReply

Or as you see fit – Envelope Sender is also controlled with this setting

To share the same interface when on a Linux server you can use screen
To start a session:
screen -S {session-name}
To join a session:
screen -x {session-name}
Both administrators will then be able to type commands fully visible to each other.